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Comments
Very interesting!
Referencing specific gravity makes it highly doubtful- the issue would be the fineness of the gold. Perhaps a regulated foreign piece.
It would be interesting to compare the thickness of a full Brasher and the half brasher. Assuming the weight provided by Breen is correct, all we need is an overlay of the two pieces, to make sure the two images are scaled properly.
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
How does the bifurcations of the letters and devices differ between the Half Doubloon and the full Doubloons, comparing an area that is close to the edge on the Half Doubloon and a ways in from the edge on the full Doubloon, such as (but not limited to) the tops of the word EXCELSIOR? This might, repeat might, indicate whether the piece was struck on a smaller planchet or struck on a larger planchet and then cut down.